After many years of trashing China, they are slowly cleaning up.
Answer:
4. Were you able to arrange
5. We are not able to answer
6. Are we able to get
7. I'd love to be able to play
8. We really enjoy being able to swim
Explanation:
just insert the words where they make sense (and change the tenses)
Change happen to happened because it is past tense
Waterfall, I think
Keeps going
